Physics of eta-prime with rooted staggered quarks

Abstract

The quark-mass dependence of the eta in the Schwinger model, which -- like the eta-prime in QCD -- becomes massive through the axial anomaly, is studied on the lattice with N_f=0,1,2. Staggered quarks are used, with a rooted determinant for N_f=1. In the chiral limit the Schwinger mass is reproduced, which suggests that the anomaly is being treated correctly.

Comments: 11 pages, 7 figures, 2 tables; v2: presentation improved, 4 refs added